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System and method for generating X-rays

a technology of generating system and generating method, applied in the field of x-ray tube, can solve the problem of essentially negative biasing of the voltage at the mesh grid with resp

Active Publication Date: 2012-12-25
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The patent text describes an X-ray tube for an imaging system that has a mesh grid to decrease the electric field at the surface of the thermionic cathode and a high voltage supply unit to establish an accelerating electric field between the thermionic cathode and the target assembly. The voltage at the mesh grid is negatively biased with respect to the voltage at the thermionic cathode. The system also includes a detector assembly to receive X-rays that pass through the object to be scanned. The method involves modulating the grid-cathode voltage to control the amperage of the electron beam, establishing an output voltage across the thermionic cathode and the target assembly to accelerate the electron beam toward the target assembly, receiving a set of imaging data indicative of the amount of attenuation of the X-rays after having passed through the object and reconstructing an image of the object based on the imaging data received. The technical effects of the patent text include improved image quality, reduced X-ray dosage, and improved X-ray tube performance."

Problems solved by technology

Further, the voltage at the mesh grid is essentially negatively biased with respect to the voltage at the thermionic cathode.

Method used

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Embodiment Construction

[0021]In the following detailed description, reference is made to the accompanying drawings that form a part hereof, and in which is shown by way of illustration specific embodiments, which may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the embodiments, and it is to be understood that other embodiments may be utilized and that logical, mechanical, electrical and other changes may be made without departing from the scope of the embodiments. The following detailed description is, therefore, not to be taken in a limiting sense.

[0022]Devices for generation of X-ray radiation are used, for example, in medical diagnostics in order to acquire radiographic images or, in case of computed tomography (CT), internal images of the body.

[0023]The operating environment for the invention is described with respect to a sixty-four-slice computed tomography (CT) system. While described with respect to a “third generation” CT scanne...

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Abstract

In one embodiment, an X-ray tube is provided. The X-ray tube comprises at least one thermionic cathode configured to generate an electron beam, a target assembly configured to generate X-rays when impinged with the electron beam emitted from the thermionic cathode, a high voltage supply unit for establishing an output voltage across the thermionic cathode and the target assembly for establishing an accelerating electric field between the thermionic cathode and the target assembly and a mesh grid disposed between the thermionic cathode and the target assembly, the mesh grid configured to operate at a voltage so as to lower the electric field applied at the surface of the thermionic cathode. Further, the voltage at the mesh grid is negatively biased with respect to the voltage at the thermionic cathode.

Description

FIELD OF INVENTION[0001]The invention generally relates to diagnostic imaging systems and more particularly to X-ray tube used in imaging systems.BACKGROUND OF THE INVENTION[0002]X-ray generating systems typically include an electron generating cathode and an anode assembly in a sealed housing. The cathode provides an electron stream or current that is directed towards the anode assembly. This focused electron beam is accelerated across the anode-to-cathode vacuum gap and produces X-rays upon impact with the anode. Because of the high power density generated at the location where the electron beam strikes the anode, it is desirable to rotate the anode assembly. Many X-ray tubes therefore include a rotating anode structure for distributing the heat generated at a focal spot.[0003]The requirements for X-ray tubes used in computed tomography have steadily grown with the manifold possibilities of computed tomography. Modern computed tomography systems require X-ray tubes that allow the ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H01J35/00
CPCA61B6/032H01J35/04H01J35/045A61B6/482A61B6/4021H01J35/06H01J2235/02H01J2235/06
Inventor LEMAITRE, SERGIOROGERS, CAREYZOU, YUNCHEN, JIZHONG
Owner GENERAL ELECTRIC CO
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